恒壓供水系統(tǒng) 全自動(dòng)恒壓供水控制原理 當(dāng)主水管網(wǎng)壓力傳感器的壓力信號(hào)4~20mA送給數(shù)字PID控制器，控制器根據(jù)壓力設(shè)定值與實(shí)際檢測值進(jìn)行PID運(yùn)算，并給出信號(hào)直接控制變頻器的轉(zhuǎn)速以使管網(wǎng)的壓力穩(wěn)定。當(dāng)用水量不是很大時(shí)，一臺(tái)泵在變頻器的控制下穩(wěn)定運(yùn)行；當(dāng)用水量大到變頻器全速運(yùn)行也不能保證管網(wǎng)的壓力穩(wěn)定時(shí)，控制器的壓力下限信號(hào)與變頻器的高速信號(hào)同時(shí)被PLC檢測到，PLC自動(dòng)將原工作在變頻狀態(tài)下的泵，投入到工頻運(yùn)行，以保持壓力的連續(xù)性，同時(shí)將一臺(tái)備用的泵用變頻器起動(dòng)后投入運(yùn)行，以加大管網(wǎng)的供水量，保證壓力穩(wěn)定。若兩臺(tái)泵運(yùn)轉(zhuǎn)仍，則依次將變頻工作狀態(tài)下的泵投入到工頻運(yùn)行，而將另一臺(tái)備用泵投入變頻運(yùn)行。當(dāng)用水量減少時(shí)，首先表現(xiàn)為變頻器已工作在最低速信號(hào)有效，這時(shí)壓力上限信號(hào)如仍出現(xiàn)，PLC首先將工頻運(yùn)行的泵停掉，以減少供水量。當(dāng)上述兩個(gè)信號(hào)仍存在時(shí)，PLC再停掉一臺(tái)工頻運(yùn)行的電機(jī)，直到最后一臺(tái)泵用主頻器恒壓供水[4]。另外，控制系統(tǒng)設(shè)兩臺(tái)泵為一組，每臺(tái)泵的電機(jī)累計(jì)運(yùn)行時(shí)間可顯示，24小時(shí)輪換一次，既保證供水系統(tǒng)有備用泵，又保證系統(tǒng)的泵有相同的運(yùn)行時(shí)間，確保了泵的可靠壽命Charmilles 1994 Roboform c400 PC Board, 854 667 d64711, 073095-203
65000377, swinc - 7-G2
AB3632
qx635, fca520ale-e, bnd-309w050-cc
mn-281 j1/0
2497811 # 2497813
2497805 # 2497807
2497303 # 2497305
2497299-000 # 2497297
bn634b566g52
15-779-31
TR-1721
NSP-11 (F), E 108407
501-04194-01, 502-03398-00
P5T-J 040 dhse 050, 145 PSI
Typ ht-55c
7005.HV.DU.J74
415-0224-004
750-306/000 -005, 750-600, 504,612, 402
ct386 rle3
TE 400S
852 514 C
4620089233, 4620089233.01
0-55325-80
AEG Schneider TSXP5730
1937997, Bretter 1936628, 1936478
MS4420B-2FB2
D 1 VW 20 dnjcl 56 75, 3000
1c 82, 3000
7H003089
am22061b-s950/1284
a04b-0218-c212
a20b-2900-0800/02a
Board 853 668 A 813205b
Wem Trafo, KD 23/1, BV 29467, 0,38
ABB DSQC 249B
CBA2F40-250-HN
QT-BB2
JANCD-MCP10, DF9202142-D1N, REV D1 JANCD-MMM02
AEG Schneider TSXP5730
a20b-2900-0280/01a
hr371, c25r38r30
dsv-10-m/dsv-10-m-0.0/0/1, 702521
1000-nx103
1000NX104
BKO-NC6851 H04
1398-sr9p
54 15c110/0p 4-80, 0-64
440f-c28013
e2530-254-032
Art # JUSP-ra05
se303a
ic600cb515n
VT130G204035, VT3B-2114
VT130G204035, VT3B-2114A
mtc02-00, fwa-mt*cnc-004-15vrs-nn
MT-CNC 02/0015 -03, FWA-MT*CNC-004-13VRS
mtc02-00, MT-CNC 04.13/05
MT-CNC 02/0011 -04
MT-CNC 02/0029 -04
MT-CNC 02/0029 -03
6219ddu av2s
romarsh transformer tx405/1
05-09-40-02/a, fax-50
1494f
A20B-1003-0340/05C
3-531-3650a, 3 533 0040g
6es7154-2aa01-0ab0 mit 6es7194-4ad00-0aa0
Saftronics Platine # b1125-1, aa1125
HURCO bmc-30/m
BY171A412G51/D
Seiki 06-00-02 HC400
pcb-s212-000, REV b1, as-212p-020
Typ by171a412g51/C
A20B-0007-0151/07A
109-525-2237b-9
900066 8000-EJA
A80L00100015-01
pa63210-0080
2ANU14A14AC
hke011-100a05, LS 061260
hke011-100a05-045326
a16b-1310-0300/03a
SL1-AK2
MNB 0.2-17
6231c-213-pm-591da
HD361SN
2000304L-B
as-s058-000
HP100-T1-CN03
bmoa-amp-f-ns-c2
A20B-2900-0811/02A
bn634b824g52
hr371/hr371b PC Board, bn634b824g52a
B106B E 100 988
a20b-2902-0302/02a
pe01441010
a20b-0003-0744/13f
k-s-dsg-01-2b2-d24-40
06-02-fw, IBM 1-04/00, SLM 2-03/03
cpub 06-02-fw, IBM 1-04/00, SLM 2-02/01
Kearney and Trecker 1-2197900
3RS1041-1GW50
FANUC PC BOARD, a20b-1000-0550/12e
6j62/eg24n9k33l
nzm6b 63, zm6a-60-800, 60a
b-83124ja-2/01
4we 6 j62/eg24n9k4
S/N 66610
TV 168
R-30iA
500FL-DOD93
MRS0428
109-525-2250b-1
twh-70s-277-sf-dgc
FCA535MWY
tek-4191
bn624a551g51, fx61c
44A294526-G01
1-2129200
CBC3MAU19AC 9.000
mt88-2542, 1 PH, 230-460/85 -110
1-21295-01
SGR-G02-1-10
Allen Bradley 1398-sr9p
Allen Bradley 1398-sr9p, Ser d1
1GN50-580
C484G7.5-3LE
pb-038
Typ ht-45c
FANUC Transformer A80L-0001-0164
vm24-Sockel, vm24s, UMK-SE 11.25-1
fx231/fx231d-s, bn624a550g52a
TDC-2A, QA-624
stb-b32.pcb, NR 5042453b
big daishowa seiki pc board, nzero, 8707
M003459712, 74102-405-53
pn5201 Drucksensor 0-3625
a20b-0009-0770/01a, a350-0009-t772/01
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